Lu Alu is a tower-pushing casual card game with hero theme. The heroes in the game have stealth skills. However, after a hero is invisible, he will only be seen when the attack or the invisibility effect time limit is reached. So what is the effect of this skill?

　　Analysis of the effect of the invisible skill of the rumbler:

　　In the game, when players use stealth, there will be a process of gradually invisibility. Although your hero is gradually becoming transparent, the enemy can still see you. In this process, if you are attacked, your gradually transparent process will become longer, but the longest will not exceed 5S.